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@rhowe
pretty much any modern phone does aGPS these days. my Nokia N95 did it...
I'm no GPS engineer but as far as I know all it does is use the identity of the mobile cell you're in to lookup where in the world you are, making it quicker for the GPS calculations to get an initial fix.
looking at Wikipedia it appears that it doesa bit more. if yo u have weak GPS reception then the aGPS node can fill in some of the blanks.
en.wikipedia.org/wiki/Assisted_GPS